Atlantic Ocean vs Norwegian Sea

Atlantic Ocean and Norwegian Sea both are nouns.

Word	Noun	Adjective	Verb	Adverb
Atlantic Ocean	Yes	No	No	No
Norwegian Sea	Yes	No	No	No

Atlantic Ocean (noun)	Norwegian Sea (noun)
the 2nd largest ocean; separates North and South America on the west from Europe and Africa on the east	the part of the Atlantic that lies off the Norwegian coast to the north of the North Sea